Rapid Screening of Potato Cultivars Tolerant to Nitrogen Deficiency Using a Hydroponic System |
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| Authors: | Xiaofang Xie Xiu-Qing Li Bernie J Zebarth Suyan Niu Ruimin Tang Helen H Tai Benoit Bizimungu Weiren Wu Muhammad Haroon |
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| Institution: | 1.College of Life Sciences,Fujian Agriculture & Forestry University,Fuzhou,China;2.Fredericton Research and Development Centre, Agriculture and Agri-Food Canada,Fredericton,Canada;3.Institute of Paulownia,Henan Agricultural University,Zhengzhou,China;4.Biochemistry and Molecular Biology, College of Life Sciences,Nanjing Agricultural University,Nanjing,China;5.Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops,Fujian Agriculture & Forestry University,Fuzhou,China |
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| Abstract: | Increased cultivar tolerance to nitrogen (N) deficiency may increase productivity and reduce environmental impact of potato crops. In this study we screened 20 cultivars for the tolerance to N-deficient (0.05 mM nitrate) in comparison with N-abundant (7.5 mM nitrate) nitrate supply using plantlets grown for 15 days in a recirculating hydroponic system. Nitrogen deficiency increased the root-to-shoot ratio in 18 cultivars. Plant total dry weight (TDW) was reduced by an average of 61% under N-deficient nitrate supply. Tolerance to N deficiency was assessed as the TDW ratio (TDWR), calculated as the ratio of TDW under N-deficient to N-abundant nitrate supply. The cultivars Norland, Raritan, Nipigon and Langlade were significantly more tolerant to nitrogen deficiency (greater TDWR) than Eramosa, Carleton, and Epicure. The results indicate that the hydroponic system has capacity to rapidly screen a large number of cultivars for tolerance to N deficiency. |
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